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LONDON, UNITED KINGDOM - NOVEMBER 23: Britain's Prime Minister Boris Johnson (on screen), Chief Medical Officer for England Chris Whitty (R) and Director of the Oxford Vaccine Group Andrew Pollard (C) attend a virtual news conference on the ongoing situation with the coronavirus disease (COVID-19) at Downing Street on November 23, 2020 in London, England. Earlier, PM Boris Johnson announced plans for new coronavirus restrictions to the House of Commons, to be implemented once the current lockdown comes to an end on December 2nd. The new three-tier system and Oxford-AstraZeneca vaccine's successful trial were discussed at the briefing. (Photo by Henry Nicholls/WPA Pool/Getty Images)

LONDON, UNITED KINGDOM - NOVEMBER 23: Britain's Prime Minister Boris Johnson (on screen), Chief Medical Officer for England Chris Whitty (R) and Director of the Oxford Vaccine Group Andrew Pollard (C) attend a virtual news conference on the ongoing situation with the coronavirus disease (COVID-19) at Downing Street on November 23, 2020 in London, England. Earlier, PM Boris Johnson announced plans for new coronavirus restrictions to the House of Commons, to be implemented once the current lockdown comes to an end on December 2nd. The new three-tier system and Oxford-AstraZeneca vaccine's successful trial were discussed at the briefing. (Photo by Henry Nicholls/WPA Pool/Getty Images)
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LONDON, UNITED KINGDOM - NOVEMBER 23: Britain's Prime Minister Boris Johnson (on screen), Chief Medical Officer for England Chris Whitty (R) and Director of the Oxford Vaccine Group Andrew Pollard (C) attend a virtual news conference on the ongoing situation with the coronavirus disease (COVID-19) at Downing Street on November 23, 2020 in London, England. Earlier, PM Boris Johnson announced plans for new coronavirus restrictions to the House of Commons, to be implemented once the current lockdown comes to an end on December 2nd. The new three-tier system and Oxford-AstraZeneca vaccine's successful trial were discussed at the briefing. (Photo by Henry Nicholls/WPA Pool/Getty Images)

LONDON, UNITED KINGDOM - NOVEMBER 23: Britain's Prime Minister Boris Johnson (on screen), Chief Medical Officer for England Chris Whitty (R) and Director of the Oxford Vaccine Group Andrew Pollard (C) attend a virtual news conference on the ongoing situation with the coronavirus disease (COVID-19) at Downing Street on November 23, 2020 in London, England. Earlier, PM Boris Johnson announced plans for new coronavirus restrictions to the House of Commons, to be implemented once the current lockdown comes to an end on December 2nd. The new three-tier system and Oxford-AstraZeneca vaccine's successful trial were discussed at the briefing. (Photo by Henry Nicholls/WPA Pool/Getty Images)
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LONDON, UNITED KINGDOM - NOVEMBER 23: Britain's Prime Minister Boris Johnson (on screen), Chief Medical Officer for England Chris Whitty (R) and Director of the Oxford Vaccine Group Andrew Pollard (C) attend a virtual news conference on the ongoing situation with the coronavirus disease (COVID-19) at Downing Street on November 23, 2020 in London, England. Earlier, PM Boris Johnson announced plans for new coronavirus restrictions to the House of Commons, to be implemented once the current lockdown comes to an end on December 2nd. The new three-tier system and Oxford-AstraZeneca vaccine's successful trial were discussed at the briefing. (Photo by Henry Nicholls/WPA Pool/Getty Images)

LONDON, UNITED KINGDOM - NOVEMBER 23: Britain's Prime Minister Boris Johnson (on screen), Chief Medical Officer for England Chris Whitty (R) and Director of the Oxford Vaccine Group Andrew Pollard (C) attend a virtual news conference on the ongoing situation with the coronavirus disease (COVID-19) at Downing Street on November 23, 2020 in London, England. Earlier, PM Boris Johnson announced plans for new coronavirus restrictions to the House of Commons, to be implemented once the current lockdown comes to an end on December 2nd. The new three-tier system and Oxford-AstraZeneca vaccine's successful trial were discussed at the briefing. (Photo by Henry Nicholls/WPA Pool/Getty Images)
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LONDON, UNITED KINGDOM - NOVEMBER 23: Chief Medical Officer for England Chris Whitty attends a virtual news conference on the ongoing situation with the coronavirus disease (COVID-19) at Downing Street on November 23, 2020 in London, England. Earlier, PM Boris Johnson announced plans for new coronavirus restrictions to the House of Commons, to be implemented once the current lockdown comes to an end on December 2nd. The new three-tier system and Oxford-AstraZeneca vaccine's successful trial were discussed at the briefing. (Photo by Henry Nicholls/WPA Pool/Getty Images)

LONDON, UNITED KINGDOM - NOVEMBER 23: Chief Medical Officer for England Chris Whitty attends a virtual news conference on the ongoing situation with the coronavirus disease (COVID-19) at Downing Street on November 23, 2020 in London, England. Earlier, PM Boris Johnson announced plans for new coronavirus restrictions to the House of Commons, to be implemented once the current lockdown comes to an end on December 2nd. The new three-tier system and Oxford-AstraZeneca vaccine's successful trial were discussed at the briefing. (Photo by Henry Nicholls/WPA Pool/Getty Images)
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LONDON, ENGLAND - APRIL 09: Chief Medical Officer Professor Chris Whitty (L) and Chief Scientific Officer, Sir Patrick Vallance arrive at 10 Downing Street ahead of the daily COVID-19 briefing on April 9, 2020 in London, England. Prime Minister Boris Johnson is still in the intensive care unit at St Thomas' Hospital after his coronavirus symptoms worsened on Monday night. There have been more than 60,000 reported cases of the COVID-19 coronavirus in the United Kingdom and 7,000 deaths. The country is in its third week of lockdown measures aimed at slowing the spread of the virus. (Photo by Peter Summers/Getty Images)

LONDON, ENGLAND - APRIL 09: Chief Medical Officer Professor Chris Whitty (L) and Chief Scientific Officer, Sir Patrick Vallance arrive at 10 Downing Street ahead of the daily COVID-19 briefing on April 9, 2020 in London, England. Prime Minister Boris Johnson is still in the intensive care unit at St Thomas' Hospital after his coronavirus symptoms worsened on Monday night. There have been more than 60,000 reported cases of the COVID-19 coronavirus in the United Kingdom and 7,000 deaths. The country is in its third week of lockdown measures aimed at slowing the spread of the virus. (Photo by Peter Summers/Getty Images)
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